The Collaborative International Dictionary of English v.0.48:

Vegetative \Veg"e*ta*tive\, a. [Cf. F. v['e]g['e]tatif.]
   [1913 Webster]
   1. Growing, or having the power of growing, as plants;
      capable of vegetating.
      [1913 Webster]

   2. Having the power to produce growth in plants; as, the
      vegetative properties of soil.
      [1913 Webster]

   3. (Biol.) Having relation to growth or nutrition; partaking
      of simple growth and enlargement of the systems of
      nutrition, apart from the sensorial or distinctively
      animal functions; vegetal.
      [1913 Webster] -- Veg"e*ta*tive*ly, adv. --
      Veg"e*ta*tive*ness, n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

vegetative
    adj 1: of or relating to an activity that is passive and
           monotonous; "a dull vegetative lifestyle" [syn:
           vegetative, vegetive]
    2: composed of vegetation or plants; "regions rich in vegetal
       products"; "vegetational cover"; "the decaying vegetative
       layer covering a forest floor" [syn: vegetal,
       vegetational, vegetative]
    3: relating to involuntary bodily functions; "vegetative
       functions such as digestion or growth or circulation"
    4: (of reproduction) characterized by asexual processes [syn:
       vegetal, vegetative]